Toxic and unsafe. Inhalation or intake of too many nickel alloy leaves, inhalation of nickel powder will stimulate the respiratory tract and eyes, causing cough, asthma, chest tightness, headache and other symptoms. Long-term exposure to high-concentration nickel alloy blades may also lead to serious diseases such as lung cancer, so nickel alloy blades are toxic and unsafe. Nickel alloy is an alloy based on nickel and added with other elements. Monel alloy, about 1905, contains about 30% copper, which is an earlier nickel alloy.